X-ray absorbing wedge for improving soft tissue outline

Details X-ray absorbing wedge for improving soft tissue outline X-ray absorbing wedge for improving soft tissue outline

1976-04-29

1978-04-04

Anderson, Bruce C.

Radiant energy

Invisible radiation responsive nonelectric signalling

Photographic type

250475, 250510, G03B 1100

Patent

active

040829570

ABSTRACT:
An X-ray cassette used in dental and medical X-ray equipment is provided with a thin, plate-like filter member of X-ray absorbing material which is sandwiched between the front plate of the cassette and the front intensifying screen. The member extends partially across the cassette to filter radiation incident on a portion of the film, and terminates in a featheredge beyond which the radiation is unfiltered. The member is tapered toward the featheredge to present a wedge-shaped cross-sectional configuration, thereby providing progressively increased soft tissue resolution away from the featheredge without producing a visible line of demarcation between the filtered and unfiltered areas of the resulting radiograph.

REFERENCES:
patent: 2387887 (1945-10-01), Dimsdale et al.
patent: 2405444 (1946-08-01), Moreau et al.
patent: 2426884 (1947-09-01), Kieffer
patent: 2441945 (1948-05-01), Frolich et al.
patent: 2496218 (1950-01-01), Kieffer
patent: 3819937 (1974-06-01), Sovijarvi et al.

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